add build description for gardener-gha-libs

Define a subset of `gardener-cicd-libs` containing a subset of cc-utils
without "heavy" dependencies against hyperscaler-SDKs + without
dependencies for packages and modules specific for
Gardener-CICD/Concourse-Template.

This package is intended to be used for future GitHub-Actions. It
contains functionality deemed helpful for both OCM-handling, and
Gardener-CICD-specialties such as release-notes-handling.

.github/workflows/build-and-test.yaml

@@ -149,6 +149,7 @@ jobs:
         echo "pkgdir: ${pkg_dir}"
         for path in \
           setup.py \
+          setup.gha.py \
           setup.oci.py \
           setup.ocm.py \
           setup.whd.py \
@@ -179,6 +180,7 @@ jobs:
           gardener-cicd-whd \
           gardener-cicd-cli \
           gardener-cicd-libs \
+          gardener-gha-libs \
           gardener-oci \
           gardener-ocm \
           ; do

setup.gha.py

@@ -0,0 +1,157 @@
+'''
+minimal (but likely growing) subset of `gardener-cicd-libs` package for usage w/ GitHubActions.
+
+This package takes special care to avoid dependencies specific towards Concourse-Pipeline-Template
+or related infrastructure (e.g. `concourse`, `ccc`, `model` packages), and also omits dependencies
+against some "heavy" packages, such as hyperscaler-SDKs, which are referenced by `gardener-cicd-libs`
+for historical reasons.
+
+Caveat: as this package has overlaps w/ `gardener-cicd-libs`, it is not adviseable to create mixed
+installations (containing both `gardener-gha-libs` and `gardener-cicd-libs`).
+'''
+
+import setuptools
+import os
+
+own_dir = os.path.abspath(os.path.dirname(__file__))
+
+
+def version():
+    with open(os.path.join(own_dir, 'ci', 'VERSION')) as f:
+        return f.read().strip()
+
+
+def requirements():
+    yield 'gardener-oci'
+    yield 'gardener-ocm'
+
+    # omit packages not needed for minimal subset of cc-utils / gardener-cicd-libs
+    omit_package_names = (
+        'Mako',
+        'Sphinx',
+        'aliyun-python-sdk-core',
+        'aliyun-python-sdk-ecs',
+        'aliyun-python-sdk-ram',
+        'brypt',
+        'boto3',
+        'cachetools',
+        'cryptography',
+        'dockerfile-parse',
+        'docutils',
+        'elasticsearch',
+        'google-api-core',
+        'google-api-python-client',
+        'google-auth',
+        'google-cloud-storage',
+        'google-crc32',
+        'kubernetes',
+        'msal',
+        'openstacksdk',
+        'oss2',
+        'pycryptodome',
+        'pylama',
+        'pylint',
+        'python-gitlab',
+        'python-keystoneclient',
+        'python-magic',
+        'python-swiftclient',
+        'pytimeparse',
+        'ruamel.yaml',
+        'slackclient',
+        'sphinx_rtd_theme',
+        'sseclient-py',
+        'urllib3',
+    )
+
+    with open(os.path.join(own_dir, 'requirements.txt')) as f:
+        for line in f.readlines():
+            line = line.strip()
+            if not line or line.startswith('#'):
+                continue
+
+            skip = False
+
+            for omit in omit_package_names:
+                if line.lower().startswith(omit.lower()):
+                    print(f'skipping: {line=}')
+                    skip = True
+                    break
+
+            if skip:
+                continue
+
+            yield line
+
+
+def modules():
+    module_names = [
+        os.path.basename(os.path.splitext(module)[0]) for module in
+        os.scandir(path=own_dir)
+        if module.is_file() and module.name.endswith('.py')
+    ]
+
+    # avoid modules that would introduce undesired dependencies
+    omit_modules = (
+        'ctx',
+        'dockerutil',
+        'http_requests',
+        'mailutil',
+        'makoutil',
+        'signingserver',
+    )
+    for name in omit_modules:
+        module_names.remove(name)
+
+    # avoid including other setup-scripts
+    module_names.remove('setup')
+    module_names.remove('setup.gha')
+    module_names.remove('setup.oci')
+    module_names.remove('setup.ocm')
+    module_names.remove('setup.whd')
+    return module_names
+
+
+def packages():
+    package_names = setuptools.find_packages(exclude=['setup'])
+
+    # avoid packages that would introduce undesired dependencies
+    omit_packages = (
+        'ccc',
+        'cfg_mgmt',
+        'checkmarx',
+        'concourse',
+        'container',
+        'ctt',
+        'delivery',
+        'dso',
+        'mail',
+        'model',
+        'slackclient',
+        'whd',
+    )
+
+    for package in omit_packages:
+        package_names.remove(package)
+
+    # skip packages installed by other distribution-packages
+    package_names.remove('oci')
+    package_names.remove('ocm')
+    return package_names
+
+
+setuptools.setup(
+    name='gardener-gha-libs',
+    version=version(),
+    description='Gardener CI/CD Libraries for GitHubActions',
+    long_description='Gardener CI/CD Libraries for GitHubActions',
+    long_description_content_type='text/markdown',
+    python_requires='>=3.12',
+    py_modules=modules(),
+    packages=packages(),
+    package_data={
+        'ci': ['VERSION'],
+    },
+    install_requires=list(requirements()),
+    entry_points={
+    },
+)

setup.py

@@ -25,6 +25,7 @@ def modules():
     ]
 
     # avoid including other setup-scripts
+    module_names.remove('setup.gha')
     module_names.remove('setup.oci')
     module_names.remove('setup.ocm')
     module_names.remove('setup.whd')